# std::messages

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< cpp‎ | locale

Defined in header `<locale>` |  |
template< class CharT > class messages; |  |

Class template `std::messages` is a standard locale facet that encapsulates retrieval of strings from message catalogs, such as the ones provided by GNU gettext or by POSIX `catgets`.

The source of the messages is implementation-defined.

Inheritance diagram

### Specializations

The standard library is guaranteed to provide the following specializations (they are required to be implemented by any locale object):

Defined in header `<locale>`
std::messages<char> | accesses narrow string message catalog
std::messages<wchar_t> | accesses wide string message catalog

### Nested types

Type | Definition
`char_type` | `CharT`
`string_type` | std::basic_string<CharT>

### Data members

Member | Description
std::locale::id `id` [static] | the identifier of the facet

### Member functions

(constructor) | constructs a new `messages` facet (public member function)
(destructor) | destructs a `messages` facet (protected member function)
open | invokes `do_open` (public member function)
get | invokes `do_get` (public member function)
close | invokes `do_close` (public member function)

### Protected member functions

do_open [virtual] | opens a named message catalog (virtual protected member function)
do_get [virtual] | retrieves a message from an open message catalog (virtual protected member function)
do_close [virtual] | closes a message catalog (virtual protected member function)

## Inherited from std::messages_base

### Nested types

Type | Definition
`catalog` | an unspecified signed integer type

### See also

messages_base | defines messages catalog type (class)
messages_byname | represents the system-supplied std::messages for the named locale (class template)

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